2019 Vol. 34, No. 2
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2019, 34(2)
:1-9.
doi: 10.3969/j.issn.2096-1553.2019.02.001
Abstract:
The research progress and present situation of cyclodextrin being applied to tobacco industry were reviewed, including the reducing tar and reducing damage, tobacco flavoring and component detection. It was pointed out that the embedment of harmful components in tobacco smoke could reduce the inhalation degree of harmful components. The embedment of tobacco flavor components and fragrances following the addition of cyclodextrin could lead to the continuous release of aroma, thereby increasing the aroma content of cigarette smoke and improving the aroma quality. The embedment of the object by cyclodextrin had chiral recognition ability to the molecular structure of the object, which could be used for the detection of isomers in various components of tobacco. The embedment of antioxidant components by cyclodextrin and their addition into tobacco could improve the health function of tobacco. The addition of cyclodextrin could improve the moisturizing function and stability of tobacco. However, the overall application of cyclodextrin in tobacco industry was still limited and the future research should focus on as follows:1) Utilizing the characteristics of different types of cyclodextrins to intercept and sustain the release of harmful components and aroma components to develop the mixed cyclodextrin application technology and improve the effect of aroma retention and tar reduction.2) Using the embedment ability of cyclodextrin to preserve aroma, in order to solve the loss of tobacco flavor components during the vacuum concentration and hot drying process in reconstituted tobacco industry.3) Using the excellent emulsifying properties of cyclodextrins to prepare the oil/water emulsion system with stable network structure, which was added into the cigarette by spraying or smearing method, giving the tobacco products special functional characteristics.
The research progress and present situation of cyclodextrin being applied to tobacco industry were reviewed, including the reducing tar and reducing damage, tobacco flavoring and component detection. It was pointed out that the embedment of harmful components in tobacco smoke could reduce the inhalation degree of harmful components. The embedment of tobacco flavor components and fragrances following the addition of cyclodextrin could lead to the continuous release of aroma, thereby increasing the aroma content of cigarette smoke and improving the aroma quality. The embedment of the object by cyclodextrin had chiral recognition ability to the molecular structure of the object, which could be used for the detection of isomers in various components of tobacco. The embedment of antioxidant components by cyclodextrin and their addition into tobacco could improve the health function of tobacco. The addition of cyclodextrin could improve the moisturizing function and stability of tobacco. However, the overall application of cyclodextrin in tobacco industry was still limited and the future research should focus on as follows:1) Utilizing the characteristics of different types of cyclodextrins to intercept and sustain the release of harmful components and aroma components to develop the mixed cyclodextrin application technology and improve the effect of aroma retention and tar reduction.2) Using the embedment ability of cyclodextrin to preserve aroma, in order to solve the loss of tobacco flavor components during the vacuum concentration and hot drying process in reconstituted tobacco industry.3) Using the excellent emulsifying properties of cyclodextrins to prepare the oil/water emulsion system with stable network structure, which was added into the cigarette by spraying or smearing method, giving the tobacco products special functional characteristics.
2019, 34(2)
:10-15.
doi: 10.3969/j.issn.2096-1553.2019.02.002
Abstract:
In order to quantitatively analyze the volume change of expanded tobacco stem after rejuvenation, the natural accumulation method, filling method and liquid impregnation method were used to measure, analyze and modify the volume of expanded tobacco stem after rejuvenation. At the same time, the correction results of volume were applied to calculate the shrinkage rate of expanded tobacco stem after rejuvenation. The results showed that the liquid impregnation method was more reliable in measuring the volume of expanded tobacco stem after rejuvenation with less fluctuation of data and good stability when compared with natural accumulation and filling method. Based on the results of liquid impregnation method, the linear relationship between liquid impregnation method (y) and natural accumulation method (x1) and filling method (x2) was established. The modified expressions were that:y=0.352x1-41.744, y=0.772x2-19.874, and the correlation coefficients R2 were 0.922 and 0.959, respectively. The volume of expanded tobacco stem after rejuvenation by modified natural accumulation method and filling method was close to that by liquid impregnation method, which is more accurate than that before amendment. The results showed that all three methods could be used to measure the volume of expanded tobacco stem, which need to be modified by liquid impregnation method to obtain more accurate results.
In order to quantitatively analyze the volume change of expanded tobacco stem after rejuvenation, the natural accumulation method, filling method and liquid impregnation method were used to measure, analyze and modify the volume of expanded tobacco stem after rejuvenation. At the same time, the correction results of volume were applied to calculate the shrinkage rate of expanded tobacco stem after rejuvenation. The results showed that the liquid impregnation method was more reliable in measuring the volume of expanded tobacco stem after rejuvenation with less fluctuation of data and good stability when compared with natural accumulation and filling method. Based on the results of liquid impregnation method, the linear relationship between liquid impregnation method (y) and natural accumulation method (x1) and filling method (x2) was established. The modified expressions were that:y=0.352x1-41.744, y=0.772x2-19.874, and the correlation coefficients R2 were 0.922 and 0.959, respectively. The volume of expanded tobacco stem after rejuvenation by modified natural accumulation method and filling method was close to that by liquid impregnation method, which is more accurate than that before amendment. The results showed that all three methods could be used to measure the volume of expanded tobacco stem, which need to be modified by liquid impregnation method to obtain more accurate results.
2019, 34(2)
:16-23.
doi: 10.3969/j.issn.2096-1553.2019.02.003
Abstract:
In order to study the effects of different atmospheres (nitrogen and air) and temperature ranges (300~500℃, 300~700℃ and 300~900℃) on the composition and amount of pyrolysis products in paper-making reconstituted tobacco substrates, solid phase microextraction, adsorption-desorption and gas chromatography-mass spectrometry methods were used for analysis. The results showed that under the nitrogen and air atmospheres, the pyrolysis products of substrates at the range of 300~700℃ and 300~900℃ obviously increased when compared with those at the range of 300~500℃. A large number of polycyclic aromatic hydrocarbons and olefins were produced in these two temperature ranges. Nicotine was only found in the pyrolysis products of substrates at the range of 300~500℃. The contents of furfural and phytadiene were higher at these three temperature ranges.In the same temperature range,under the air atmosphere,the release amount of important cleavage products such as crotonaldehyde,2-methyl-furan and furfural with relatively low molecular weight was higher than that under nitrogen atmosphere. The relative release of alcohols increased, and the presence of oxygen in air promoted the full combustion of substrates, thereby resulting in the reduction of total pyrolysis products.
In order to study the effects of different atmospheres (nitrogen and air) and temperature ranges (300~500℃, 300~700℃ and 300~900℃) on the composition and amount of pyrolysis products in paper-making reconstituted tobacco substrates, solid phase microextraction, adsorption-desorption and gas chromatography-mass spectrometry methods were used for analysis. The results showed that under the nitrogen and air atmospheres, the pyrolysis products of substrates at the range of 300~700℃ and 300~900℃ obviously increased when compared with those at the range of 300~500℃. A large number of polycyclic aromatic hydrocarbons and olefins were produced in these two temperature ranges. Nicotine was only found in the pyrolysis products of substrates at the range of 300~500℃. The contents of furfural and phytadiene were higher at these three temperature ranges.In the same temperature range,under the air atmosphere,the release amount of important cleavage products such as crotonaldehyde,2-methyl-furan and furfural with relatively low molecular weight was higher than that under nitrogen atmosphere. The relative release of alcohols increased, and the presence of oxygen in air promoted the full combustion of substrates, thereby resulting in the reduction of total pyrolysis products.
2019, 34(2)
:24-34.
doi: 10.3969/j.issn.2096-1553.2019.02.004
Abstract:
Considering the potential safety hazard of chemical preservatives for cigarette flavoring liquid, the high hydrostatic pressure (HHP) technology was applied to the sterilization of tobacco flavor liquid. The effects of technological parameters of HHP on the sterilization efficacy of tobacco flavor liquor and the sensory quality of cigarettes following tobacco flavoring liquid application after sterilization were investigated. The results showed that when the treatment temperature was 38℃, the holding time was 13.1 min, and the treatment pressure was 447 MPa, the color and viscosity of tobacco flavor liquor had no obvious change when compared with that before HHP treatment. The growth of gas producing microorganism was well controlled, and the biogas production of tobacco flavoring liquid obviously reduced with the increase in shelf life. When the tobacco flavoring liquid after sterilization treatment was added into the cigarettes, there was no significant difference in sensory evaluation when compared with the raw material liquid.Therefore, under the premise of not changing the sensory quality of the tobacco flavor liquid, HHP is expected to be used as a low-temperature, safe sterilization technology for the sterilization and antiseptic of the tobacco flavor liquid.
Considering the potential safety hazard of chemical preservatives for cigarette flavoring liquid, the high hydrostatic pressure (HHP) technology was applied to the sterilization of tobacco flavor liquid. The effects of technological parameters of HHP on the sterilization efficacy of tobacco flavor liquor and the sensory quality of cigarettes following tobacco flavoring liquid application after sterilization were investigated. The results showed that when the treatment temperature was 38℃, the holding time was 13.1 min, and the treatment pressure was 447 MPa, the color and viscosity of tobacco flavor liquor had no obvious change when compared with that before HHP treatment. The growth of gas producing microorganism was well controlled, and the biogas production of tobacco flavoring liquid obviously reduced with the increase in shelf life. When the tobacco flavoring liquid after sterilization treatment was added into the cigarettes, there was no significant difference in sensory evaluation when compared with the raw material liquid.Therefore, under the premise of not changing the sensory quality of the tobacco flavor liquid, HHP is expected to be used as a low-temperature, safe sterilization technology for the sterilization and antiseptic of the tobacco flavor liquid.
2019, 34(2)
:35-42.
doi: 10.3969/j.issn.2096-1553.2019.02.005
Abstract:
The epoxy resin (EP) was toughened by the hydroxyl-terminated polyurethane (PU) which was synthesized by polyethylene glycol (PEG) 400 and isophorone diisocyanate (IPDI) with step-by-step and one-step methods. Toughened EP materials were prepared by EP, hydroxyl-terminated PU and triethylene tetramine. The mechanical properties and thermal properties of toughened EP were investigated. Results showed that the infrared spectra of hydroxyl-terminated PU synthesized by the two methods were approximately the same in shape.When the addition of hydroxyl-terminated PU(equivalent ratio of-OH and -NCO 6:5) was 15 phr,the elongation at break was 11.1%, the tensile shear strength was 14.9 MPa and the impact strength was 25.7 kJ/m2, which were 0.8 times,1.3 times and 1.9 times higher than those of pure EP, respectively. The toughness and bonding performance of EP were significantly improved. The Tg of hydroxyl-terminated PU toughened EP materials decreased when it was homogeneous phase and microphase separation system (hydroxyl-terminated PU content Tg decreased. The hydroxyl-terminated PU synthesized by one-step method realized EP's high-efficiency toughening and avoided the presence of benzene ring in the molecular structure, which not only improved EP's weather resistance, but also realized the rapid curing of toughened EP at room temperature. The method provides a new way for EP's toughening and rapid curing.
The epoxy resin (EP) was toughened by the hydroxyl-terminated polyurethane (PU) which was synthesized by polyethylene glycol (PEG) 400 and isophorone diisocyanate (IPDI) with step-by-step and one-step methods. Toughened EP materials were prepared by EP, hydroxyl-terminated PU and triethylene tetramine. The mechanical properties and thermal properties of toughened EP were investigated. Results showed that the infrared spectra of hydroxyl-terminated PU synthesized by the two methods were approximately the same in shape.When the addition of hydroxyl-terminated PU(equivalent ratio of-OH and -NCO 6:5) was 15 phr,the elongation at break was 11.1%, the tensile shear strength was 14.9 MPa and the impact strength was 25.7 kJ/m2, which were 0.8 times,1.3 times and 1.9 times higher than those of pure EP, respectively. The toughness and bonding performance of EP were significantly improved. The Tg of hydroxyl-terminated PU toughened EP materials decreased when it was homogeneous phase and microphase separation system (hydroxyl-terminated PU content Tg decreased. The hydroxyl-terminated PU synthesized by one-step method realized EP's high-efficiency toughening and avoided the presence of benzene ring in the molecular structure, which not only improved EP's weather resistance, but also realized the rapid curing of toughened EP at room temperature. The method provides a new way for EP's toughening and rapid curing.
Effect of Ti4+ doping Fe site on the structure and dielectric properties for CuFeO2 ceramic material
2019, 34(2)
:43-49.
doi: 10.3969/j.issn.2096-1553.2019.02.006
Abstract:
CuO,Fe2O3 and TiO2 were used as the main raw materials, and CuFe1-xTixO2 (0 ≤ x ≤ 0.08) ceramic series samples were prepared by solid state reaction method. The microstructure, morphology and dielectric properties of the samples obtained were characterized and analyzed. The internal barrier model (IBLC) was used to physically interpret the correlation between the microstructure and dielectric properties of the samples. The results showed that the doped series samples had a single-phase copper iron ore structure. Appropriate amount of Ti4+ doping could promote the grain growth of CuFeO2 ceramic samples, while the larger concentration of Ti4+ significantly inhibited the grain growth of CuFeO2 ceramic samples, and damaged the denser crystal morphology. Undoped and a small amount of Ti4+-doped (x=0.005 and 0.01) CuFeO2 samples exhibited room temperature giant dielectric properties, and proper doping of Ti4+ could effectively improve the dielectric properties of the system; IBLC model could explain the intercalation of Ti4+-doped CuFeO2 samples. The electrical mechanism, that is, the microscopic morphology of the CuFeO2 ceramic system could significantly affect the giant dielectric properties of the system.
CuO,Fe2O3 and TiO2 were used as the main raw materials, and CuFe1-xTixO2 (0 ≤ x ≤ 0.08) ceramic series samples were prepared by solid state reaction method. The microstructure, morphology and dielectric properties of the samples obtained were characterized and analyzed. The internal barrier model (IBLC) was used to physically interpret the correlation between the microstructure and dielectric properties of the samples. The results showed that the doped series samples had a single-phase copper iron ore structure. Appropriate amount of Ti4+ doping could promote the grain growth of CuFeO2 ceramic samples, while the larger concentration of Ti4+ significantly inhibited the grain growth of CuFeO2 ceramic samples, and damaged the denser crystal morphology. Undoped and a small amount of Ti4+-doped (x=0.005 and 0.01) CuFeO2 samples exhibited room temperature giant dielectric properties, and proper doping of Ti4+ could effectively improve the dielectric properties of the system; IBLC model could explain the intercalation of Ti4+-doped CuFeO2 samples. The electrical mechanism, that is, the microscopic morphology of the CuFeO2 ceramic system could significantly affect the giant dielectric properties of the system.
2019, 34(2)
:50-55.
doi: 10.3969/j.issn.2096-1553.2019.02.007
Abstract:
A Ce-doped ZnO nanomaterial was prepared by a simple method of sol-gel and chemical vapor deposition. The structure, morphology, band structure and luminescence properties of the ZnO nanomaterials were analyzed. The results showed that the nanomaterial was similar to a screwdriver,and consisted of a hexagonal micron substrate and a nanorod top. It had a good single crystal structure; its preparation process conformed to the VLS growth mechanism, and the vapor concentrations of Zn and Ce had a very large influence on the growth rate of each crystal face; Compared with ZnO nanomaterials, the Zn 2p3/2 peak in the nanomaterials shifted to a lower energy level, while the O1s peak shifted to a higher energy level. The doping of Ce affected the electronic structure and band gap structure of ZnO;its UV emission peak was reduced and accompanied by red shift, and the intensity of green light emission was improved. The nanomaterial prepared has a good application prospect in assembling nanodevices.
A Ce-doped ZnO nanomaterial was prepared by a simple method of sol-gel and chemical vapor deposition. The structure, morphology, band structure and luminescence properties of the ZnO nanomaterials were analyzed. The results showed that the nanomaterial was similar to a screwdriver,and consisted of a hexagonal micron substrate and a nanorod top. It had a good single crystal structure; its preparation process conformed to the VLS growth mechanism, and the vapor concentrations of Zn and Ce had a very large influence on the growth rate of each crystal face; Compared with ZnO nanomaterials, the Zn 2p3/2 peak in the nanomaterials shifted to a lower energy level, while the O1s peak shifted to a higher energy level. The doping of Ce affected the electronic structure and band gap structure of ZnO;its UV emission peak was reduced and accompanied by red shift, and the intensity of green light emission was improved. The nanomaterial prepared has a good application prospect in assembling nanodevices.
2019, 34(2)
:56-62.
doi: 10.3969/j.issn.2096-1553.2019.02.008
Abstract:
Corn cob was used as raw material to chemically modify corn cob with KMnO4. The effects of corn cob dosage, pH value, temperature and adsorption time on the adsorption of Zn2+ and Cu2+ heavy metal ions were investigated. The structure and morphology were characterized. The results showed that for 100 mL of metal ion solution with a concentration of 20 mg/L, the adsorbent was suitable for 3.0 g, adsorption time was 1 h, temperature was 25℃, pH value controlled in 3~7, the modified corn cob had strong adsorption capacity for Zn2+ and Cu2+; the number of modified corn cob -OH groups increased, the surface of new ecological MnO2 formed, the modified corn cob produced many new pores, and the specific surface area increased, indicating that the modification could significantly improve the adsorption capacity of the corn cob.
Corn cob was used as raw material to chemically modify corn cob with KMnO4. The effects of corn cob dosage, pH value, temperature and adsorption time on the adsorption of Zn2+ and Cu2+ heavy metal ions were investigated. The structure and morphology were characterized. The results showed that for 100 mL of metal ion solution with a concentration of 20 mg/L, the adsorbent was suitable for 3.0 g, adsorption time was 1 h, temperature was 25℃, pH value controlled in 3~7, the modified corn cob had strong adsorption capacity for Zn2+ and Cu2+; the number of modified corn cob -OH groups increased, the surface of new ecological MnO2 formed, the modified corn cob produced many new pores, and the specific surface area increased, indicating that the modification could significantly improve the adsorption capacity of the corn cob.
2019, 34(2)
:63-70.
doi: 10.3969/j.issn.2096-1553.2019.02.009
Abstract:
The volatile components of 10 agarwood samples from 5 countries (Kalimantan, Malaysia, Bangladesh, India, Indonesia) were analyzed by headspace gas chromatography-mass spectrometry (HS-GC-MS). The results showed that the volatile components of 10 agarwood samples were mainly aromatic and sesquiterpenoids. The types and relative contents of volatile components of agarwood samples with the same origin but different morphology were different. The volatile components of the samples also showed certain differences. The mannene and (+)-cyclodecene were only detected in the agarwood samples of Malaysia and could be used as the characteristic components of the agarwood in the producing area; α-cluene and β-Guaiacrox were only detected in Indonesian agarwood samples and could be used as the characteristic component of the agarwood in this area; (+)-α-long-leafene and α-carboene were only detected in Indian agarwood samples and could be used as the characteristic component of agarwood in this area; the types and contents of alcohols in agarwood samples from Indonesia were significantly lower than those in other places. The results could provide a new idea for the rapid detection and identification of the agarwood production area.
The volatile components of 10 agarwood samples from 5 countries (Kalimantan, Malaysia, Bangladesh, India, Indonesia) were analyzed by headspace gas chromatography-mass spectrometry (HS-GC-MS). The results showed that the volatile components of 10 agarwood samples were mainly aromatic and sesquiterpenoids. The types and relative contents of volatile components of agarwood samples with the same origin but different morphology were different. The volatile components of the samples also showed certain differences. The mannene and (+)-cyclodecene were only detected in the agarwood samples of Malaysia and could be used as the characteristic components of the agarwood in the producing area; α-cluene and β-Guaiacrox were only detected in Indonesian agarwood samples and could be used as the characteristic component of the agarwood in this area; (+)-α-long-leafene and α-carboene were only detected in Indian agarwood samples and could be used as the characteristic component of agarwood in this area; the types and contents of alcohols in agarwood samples from Indonesia were significantly lower than those in other places. The results could provide a new idea for the rapid detection and identification of the agarwood production area.
2019, 34(2)
:71-81.
doi: 10.3969/j.issn.2096-1553.2019.02.010
Abstract:
The current situation of fruit recognition based on machine vision was reviewed from fruit recognition based on color threshold, shape and texture, three-dimensional fruit shape recognition, nocturnal fruit recognition, fruit recognition based on machine learning, fruit recognition under the influence of shadow and occlusion. It's thought that the algorithms involved in the above research were more complicated and features were very powerful. However, in view of the limitations of visual theory, image processing technology and hardware conditions, as well as the complex and varied environment of apple garden, there was no more ideal technology for machine vision-based fruit recognition, and it needed to be improved. Future research focuses include:1) Strengthening more effective algorithms for image enhancement, image segmentation, and feature extraction to effectively address the effects of fruit overlap, occlusion, color, and light changes; and improving the identification algorithms for day and night orchard field operations for the construction of an all-weather operation picking robot. 2) Strengthening the research on fruit recognition based on self-supervised learning to increase the feedback information received by the model and the complex applicable task types of model representation, reduce the proportion of human manual labor involved in the task, and improve the degree of automation. 3) Strengthening the research of automatic image acquisition and fruit recognition, combined with computer vision and near-infrared, laser radar and other detection technologies, integrating multi-modal image and non-image information for fruit recognition, improving processing speed and real-time, and identifing accuracy and system robustness to provide reference for apple's automatic picking and precise management of orchard.
The current situation of fruit recognition based on machine vision was reviewed from fruit recognition based on color threshold, shape and texture, three-dimensional fruit shape recognition, nocturnal fruit recognition, fruit recognition based on machine learning, fruit recognition under the influence of shadow and occlusion. It's thought that the algorithms involved in the above research were more complicated and features were very powerful. However, in view of the limitations of visual theory, image processing technology and hardware conditions, as well as the complex and varied environment of apple garden, there was no more ideal technology for machine vision-based fruit recognition, and it needed to be improved. Future research focuses include:1) Strengthening more effective algorithms for image enhancement, image segmentation, and feature extraction to effectively address the effects of fruit overlap, occlusion, color, and light changes; and improving the identification algorithms for day and night orchard field operations for the construction of an all-weather operation picking robot. 2) Strengthening the research on fruit recognition based on self-supervised learning to increase the feedback information received by the model and the complex applicable task types of model representation, reduce the proportion of human manual labor involved in the task, and improve the degree of automation. 3) Strengthening the research of automatic image acquisition and fruit recognition, combined with computer vision and near-infrared, laser radar and other detection technologies, integrating multi-modal image and non-image information for fruit recognition, improving processing speed and real-time, and identifing accuracy and system robustness to provide reference for apple's automatic picking and precise management of orchard.
2019, 34(2)
:82-87.
doi: 10.3969/j.issn.2096-1553.2019.02.011
Abstract:
Aiming at the low real-time processing efficiency of massive astronomical data, through time-consuming analysis of gridding algorithm in SKA image acquisition and imaging ARL library, two functions of convolutional-grid and convolutional-degrid with high frequency and long running time were found out in this algorithm. Then, two functions were parallelized on GPU by multi-threading to realize the cooperative operation of gridding algorithm on GPU and CPU. The experimental results showed that under the same amount of data, the running time of the improved gridding algorithm was greatly shortened, especially when dealing with massive data, the overall running efficiency of ARL was effectively improved.
Aiming at the low real-time processing efficiency of massive astronomical data, through time-consuming analysis of gridding algorithm in SKA image acquisition and imaging ARL library, two functions of convolutional-grid and convolutional-degrid with high frequency and long running time were found out in this algorithm. Then, two functions were parallelized on GPU by multi-threading to realize the cooperative operation of gridding algorithm on GPU and CPU. The experimental results showed that under the same amount of data, the running time of the improved gridding algorithm was greatly shortened, especially when dealing with massive data, the overall running efficiency of ARL was effectively improved.
2019, 34(2)
:88-94.
doi: 10.3969/j.issn.2096-1553.2019.02.012
Abstract:
The deconvolution algorithm in the ARL of the SKA algorithm reference library is inefficient and cannot meet the needs of real-time processing of massive data. The parallelized Clean algorithm in the cooperative working mode of CPU and GPU was proposed. The steps of parallel computing in Clean algorithm were executed in parallel on GPU using multi-threads, and the steps in the Clean algorithm that couldn't be parallelized were executed serially on the CPU. The results showed that the running time of parallel Clean algorithm under CPU and GPU cooperative mode was significantly shorter than that under CPU. When the image size reached 4096×4096, the parallel Clean algorithm GPU cooperative mode could be speeded up by 10 times, which showed that the parallel Clean algorithm could significantly improve the efficiency of operation when dealing with massive data.
The deconvolution algorithm in the ARL of the SKA algorithm reference library is inefficient and cannot meet the needs of real-time processing of massive data. The parallelized Clean algorithm in the cooperative working mode of CPU and GPU was proposed. The steps of parallel computing in Clean algorithm were executed in parallel on GPU using multi-threads, and the steps in the Clean algorithm that couldn't be parallelized were executed serially on the CPU. The results showed that the running time of parallel Clean algorithm under CPU and GPU cooperative mode was significantly shorter than that under CPU. When the image size reached 4096×4096, the parallel Clean algorithm GPU cooperative mode could be speeded up by 10 times, which showed that the parallel Clean algorithm could significantly improve the efficiency of operation when dealing with massive data.
2019, 34(2)
:95-101.
doi: 10.3969/j.issn.2096-1553.2019.02.013
Abstract:
Aiming at the problem that the thermal stress of the large rectangular spinning box affects the support, taking the 12-bit biphenyl gas-phase heating large spinning box of a company as the research object, the ANSYS finite element analysis of the whole structure of the rectangular spinning box was carried out, the influence of the support on the temperature variation law of the support was studied, and the thermal stress variation of the support under different external constraints was analyzed. The results showed that the heat dissipation of the support through the support was faster than that in the air. Even if the insulation layer was added to the support and the support surface, there was still a large temperature gradient in the support area. For spinning box, the maximum thermal stress occured at the bolt hole of the box support, the thermal stress at the four corners of the pump seat was more obvious, and the temperature gradient of the spinning box assembly ring was smaller. When the temperature gradient was less than 10℃, the thermal stress of the support was not affected by the change of the constraint.When the engineering design apply, the material with good thermal insulation properties is selected and the ability of bolt tightness is adjusted properly in order to reduce thermal stress and ensure the safe operation of equipment.
Aiming at the problem that the thermal stress of the large rectangular spinning box affects the support, taking the 12-bit biphenyl gas-phase heating large spinning box of a company as the research object, the ANSYS finite element analysis of the whole structure of the rectangular spinning box was carried out, the influence of the support on the temperature variation law of the support was studied, and the thermal stress variation of the support under different external constraints was analyzed. The results showed that the heat dissipation of the support through the support was faster than that in the air. Even if the insulation layer was added to the support and the support surface, there was still a large temperature gradient in the support area. For spinning box, the maximum thermal stress occured at the bolt hole of the box support, the thermal stress at the four corners of the pump seat was more obvious, and the temperature gradient of the spinning box assembly ring was smaller. When the temperature gradient was less than 10℃, the thermal stress of the support was not affected by the change of the constraint.When the engineering design apply, the material with good thermal insulation properties is selected and the ability of bolt tightness is adjusted properly in order to reduce thermal stress and ensure the safe operation of equipment.
2019, 34(2)
:102-108.
doi: 10.3969/j.issn.2096-1553.2019.02.014
Abstract:
Aiming at the problem of offset and inclination between supervisor and branch pipe in actual production, which is not suitable for special robots to weld intersecting line, the model of 6-DOF mainpulator and positioner with D-H parameters was constructed through improving the mathematical model of intersecting line, a coordinate transformation relationship between workpiece clamp model and model was put forward, and finally the welding line parameters was solved by main-plane dichotomy method. The motion planning of special robot continuous welding operation was realized. The simulation results of Matlab showed that the intersection trajectory was smooth and basically coincided with the actual contour, which proved the correctness of the research method.
Aiming at the problem of offset and inclination between supervisor and branch pipe in actual production, which is not suitable for special robots to weld intersecting line, the model of 6-DOF mainpulator and positioner with D-H parameters was constructed through improving the mathematical model of intersecting line, a coordinate transformation relationship between workpiece clamp model and model was put forward, and finally the welding line parameters was solved by main-plane dichotomy method. The motion planning of special robot continuous welding operation was realized. The simulation results of Matlab showed that the intersection trajectory was smooth and basically coincided with the actual contour, which proved the correctness of the research method.
Journal Information
Founded in 1986， bimonthly
Administered by：The Education Department Henan Province
Sponsored by：Zhengzhou University of Light Industry
Editor-in-chief：Wei Shizhong
Executive Editor-in-Chief：Zou Lin
Deputy Editor-in-Chief：Qu Shuanghong
Edited & published by：Editorial Department of Journal of Light Industry
CN 41-1437/TS
ISSN 2096-1553
Address：136 Science Avenue, Zhengzhou City, Henan Province, China
Postal Code：450001
Tel：(086)0371-86608635
(086)0371-86608633
